Clear calloc block only if malloc succeeds #4208
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Calloc was calling memset(0) on NULL when its implicit malloc failed, causing a crash in UMM. Instead, only do the memset if the memory allocation succeeds. Fixes issue esp8266#4207
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Calloc was calling memset(0) on NULL when its implicit malloc failed,
causing a crash in UMM. Instead, only do the memset if the memory
allocation succeeds.
Fixes issue #4207